Overview
The ZF 4644.159.118 SHIFT SYSTEM is a precision-engineered mechanical assembly designed specifically for the WG 201 series of powershift transmissions. This OEM genuine part controls the engagement and disengagement of gear ratios by translating driver input into precise hydraulic valve actuation within the transmission control module. Located between the transmission housing and the valve body, the shift system ensures smooth, consistent gear changes under heavy load conditions. The SKU 4644.159.118 is manufactured to ZF’s original tolerances, guaranteeing direct interchangeability with the factory-installed component. When paired with a robust TRANSMISSION HOUSING (4644101203), this shift system maintains the structural integrity required for high-torque industrial applications.
Symptoms of Failure
- Delayed or harsh gear engagement: When the shift system wears, operators experience a noticeable lag or jarring sensation when moving between forward and reverse, often accompanied by grinding noises.
- Intermittent gear slippage under load: A failing 4644.159.118 can cause the transmission to momentarily lose drive power during acceleration, particularly in lower gears, leading to reduced productivity.
- Hydraulic fluid contamination: Internal wear particles from the shift system can migrate into the oil circuit, causing premature failure of seals and valves. This often manifests as dark, metallic-flecked transmission fluid.
- Neutral lockout or stuck gear: The shift mechanism may fail to fully disengage, leaving the transmission locked in one gear and requiring manual intervention to reset the system.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.159.118 |
| OEM Reference | ZF 4644.159.118 |
| Material | Hardened alloy steel with corrosion-resistant coating |
| Weight | 1.85 kg (4.08 lbs) |
| Overall Length | 245 mm |
| Mounting Bolt Pattern | 4-hole, 90 mm spacing |
| Operating Temperature Range | -40°C to +120°C |
| Sealing Interface | Compatible with O-RING (0634306198) and SEALING RING (0634801098) |
| Identification | Includes TYPE PLATE (0730365067) |
Compatibility
This shift system is engineered for the ZF WG 201 series, which encompasses the WG180, WG200, and WG210 transmission models commonly found in mobile cranes, wheel loaders, and heavy-duty forklifts. The 4644.159.118 also fits select variants of the WG 150 series when used with the appropriate TRANSMISSION HOUSING (4644301382). For proper installation, ensure the THREADED BUSH (4644301189) and SCREW PLUG (0636302005) are replaced simultaneously to maintain correct preload and sealing integrity. Always verify your transmission’s serial number against ZF’s compatibility chart before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101203 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301382 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for shift linkage |
| 0636302005 | SCREW PLUG | Seals hydraulic port in shift system bore |
| 0634306198 | O-RING | Prevents fluid leakage at shift shaft |
| 0634801098 | SEALING RING | Secondary seal for high-pressure zones |
| 0730365067 | TYPE PLATE | Identification label with OEM specs |
| 0631311009 | GROOVED STUD | Alignment pin for shift system mounting |
| 4644301161 | COVER PLATE | Protects shift mechanism from debris |
| 0636100621 | HEXAGON SCREW | Fastener for shift system assembly |
ZF 4644.159.118 SHIFT SYSTEM – Shift System RFQ Support
PartsZF supports ZF 4644.159.118 SHIFT SYSTEM RFQs by checking the part number, related documentation, and buyer-supplied transmission context before quotation.
Part-Number Summary
Use ZF number 4644.159.118 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: SHIFT SYSTEM
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4644.159.118 |
|---|---|
| Normalized SKU | 4644159118 |
| Part name | SHIFT SYSTEM |
| Product category | shift system |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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